Rotary drilling bit



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Jan. 25,1927.

W. T. WOODS ROTARY DRILLING BIT Filed July 12 1926 gww'ntoc Walter T Woods attozwm ya Patented Jan. 25, 1927.

UNITED STATES PATENT OFFICE.

WALTER T. WOODS, OF LONG BEACH, CALIFORNIA, ASSIGNOR TO U. S. TOOL COMPANY, OF LONG BEACH, CALIFORNIA. A CORPORATION OF CALIFORNIA.

ROTARY DRILLING BIT.

Application filed July 12,

This invention relates to rotary drilling bits of the type employed in the hydraulic rotary system of drilling wells.

The disk bits heretofore employed in drilling wells have had a tendency to lose one or. more of their rotary cutters from the bit during drilling operations, with the result that the cutter becomes lodged in the bottom of the well where it'is extremely diflicult to remove the same from the well hole. Moreover, it may happen in the drilling of a well that the bit will be continued drilling in the well hole until the lower portion of the legs of the bit are worn away, which will permit the cutters, pins and mounting to drop from the bit body.

An object of the present invention is to provide a disk bit with certain novel means for mounting the rotary cutters on the bit, which means will substantially reduce the dam er that the cutters. will be lost from the bit.

A further object of the present invention is to provide a means by which the mounting pins of the disk may be readily welded to the legs of the "bit.

Another object of the resent invention is to provide a disk bit aving a welded mounting member or pin which cannot be lost from the bit even in case of a defect .in the weldin operation.

Various urther objects and advantages of the present invention will be apparent from a description of the preferred embodiment of the invention. For this purpose, reference is made to the accompanying drawings in which is illustrated one example of a disk bit embod ing the present invention.

In the rawings:

Figure 1 is a vertical elevation of the preferred form of well bit,

Figure 2 is an enlarged elevation at right angles to Figure 1 of the lower portion of the bit, partially in section,

Figure 3 is an enlarged perspective view of one of the cutters, and,

Figure 4 is an end view of the mounting means.

Referring to the drawings, the well bit there illustrated comprises an elongated body 1 having an enlargement 2 near its upper end and terminating in a tapered pin 3 by which the hit may be attached to a stand of drill pipe and rotated during the drilling operations. The body 1 is provided 1926. Serial No. 121.802.

bent forwardly in the direction of rotation ot' the bit and preferably parallel, as most clearly indicated in Figure 2.

Each leg serves to support or mount a disk cutter 5. The cutters are supported on the inner sides of the legs so that they are disposed between the legs and the legs are sufliciently spaced apart so that there is provided between the cutters, a substantial space through which the mud or detritus cut by the bit may pass. There is provided an axial passage 7 through the body for conveying flushing fluid from the supporting drill pipe and dischargin the same into this space between the legs w ere it may admix with the detritus and aid in disintegrating and forming a mud fluid with the same.

Each of the disks 5 is mounted upon its supporting leg in a similar manner and hence, only one of the mountings will be described. The mountings include a pin 10, part of which is inserted in the legs 4 and the other part extending inwardly from the legs. The latter part 12 is screwthreaded and the inner part 11 of the pins taper outwardly, as best indicated in Figure 2. In securing the pins to the legs, there is first cut in the legs, an opening indicated at 12 having tapering walls which will provide a recess around the outer end of the pins, which is filled with metal to weld the pin 10 to the leg 4. Said metal is indicated, as at 13. It will b seen that from this method of welding the pin 10 to the leg 4, that the pin 10 is securely held to the leg and cannot move inwardly and drop from the leg even in case of a defective weld in view of the-tapering of the portion 11 of the in.

T e threaded portion 12 of the pin is threaded to a bushing 9, which is provided with a flange 14 of enlarged diameter which fits partially within a recess 15 in the inner side of the leg and thus operates by its ongagement with the side of the leg to brace the mounting. There is also provided a nut 16 screw-threaded upon the end of the pin 10, which forms part of the bearing surface for the cutters 5 and also provides a flange 17 partially fitting within a recess in the cutter 5 for retaining the cutter in place. Said retaining nut is provided with an annular groove 20 near its inner end and with a plurality of pairs of alined recesses 21 in its ends, which recesses :21 pass through the annular recess 20. The pin 10 is also indicated as provided with a rece s 2:2 adapted to register with one pair of the recesses 21 so that in such position, a locking bar 223 may be placed in the alined recesses and lock the retaining nut from rotation oil the pin i Said locking bar 23 is in turn held in place by a ring 24 placed in th annular groove Qt) in the end otithe retaining nut lb and pasung through a hole 516 and a notch 25 in the opposed ends of the locking bar 23.

'lhe mounting thus described provide an exceptionally etlicient and eti'ective means of retaining the disk to the bit body 1 and insures that the same cannot be dislocated therefrom.

While the particular form of the invention herein described is well adapted to accomplish the objects, purposes and advantages of the invention, it is understood that VEIIlOtts modifications, changes, and ubstitutions o1 equivalents may be made without departing from the invention. and the invention includes all such modifications, changes, substitutions and equivalents as come within the scope of the appended claims.

l claim:

it. [it rotary drilling bit comprising a body, having an inwardly tapering opening therethrough, an inwardly tapering pin in said opening, there being a space surrounding the pin, and the pin being united to the body by welding so that the welding material fills said space, and a rotary cutter mounted on said pin.

2. A rotary drilling bit, comprising a body having an inwardly tapering opening therethrough, and a recess, a pin having an inwardly tapering portion located in said opening, and a bushing mounted on said pin and provided with a flange located in said recess. the pin being united to the body by welding so that the welding material fills the space between the tapering portion of the pin and said opening, and a rotary cutter mounted on the bushing.

3.1a rotary drilling bit, comprising a body having a recess, a bushing having an annular radial flange set into said recess, a pin having a tapering section extending through a tapering opening in the body. and a section extending into said bushing. said pin being welded to said body. and a rot ary cutter mounted by the bushing.

t. A rotary drilling bit. comprising a body having a plurality oi spaced legs. disk cutters mounted between the legs, bushings for the cutters having tlanged ends titted into said le s, and a tension pin extending through said legs and bushings, the/pins tapering to an enlarged diameter at their outer ends and located in tapered openings in the legs, said ends being Welded to the legs.

5. A rotary drillin bit, comprising a body, a pin supported by the body, a bushing mounted upon the pin, a disk cutter re volvably mounted on the bushing, a retaining nut mounted upon the pin having a bear ing surface thereon for the disk cutter, said retaining nut having an annular recess, and a plurality of pairs of alined end recesses, there being an end recess in the pin adapted to register with the pairs of recesses in the retaining nut, a lock bar positioned in a pair of the recesses of the retaining nut and in the recess in the pin, and a spring wire in the annular recess of the retaining nut engaging said lock bar;

(i. A. rotary drilling bit, comprising a body, a pin supported by the body, a bushing mounted upon the pin, a disk cutter supported by the bushin a retaining nut mounted upon the pin forming a bearing surface for the disk, a lock bar engaging said pin and retaining nut, and a spring Wire engaging said lock bar for holding the same in engagement with said retaining nut.

7. A rotary drilling bit, comprising a body, a bushing having one end fitted into said body, a pin supported by the body and extending through said bushing, a retaining nut supported by the pin, and a disk cutter mounted upon said bushing and retaining nut so that both the bushing and retaining nut provide bearing surfaces therefor.

8. A rotary drilling bit, comprising a body, a pin supported by the body, a disk cutter mounted on the pin, a bushing on the pin, a retaining nut mounted upon the end ofthe pin, said bushing and nut supporting and forming bearing surfaces for the disk cutter. said retaining nut having a plurality of pairs of alined end recesses. an end recess in the pin, a lock bar fitted in said end recess and in a pair of said alined recesses, and a spring wire supported by the retaining nut and engaging said lock bar.

9. A rotary drilling bit, comprising a body, a pin having a tapered end, a tapered recess in the body in which said tapered end is positioned, welding inaterial welded between said pin and body in position to be locked by said enlarged end in said bodyo and a rotary cutter mounted by the pin.

10. A rotary drilling bit, comprising a body having a recess. a bushing having an integral radial bracing flange titted into said recess. a tension pin extending through said bushing and having a tapered end welded into a tapered opening in said body, and a lock nut secured to said pin.

Signed at Los Angeles, California, this 29th day of June, 1926.

WALTER T. VVQC DS.

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